Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9e09cc5067c476…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 19:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bf2556da7c2de89b593c94c0531df3c3 SHA-1: 463b4916576c827565e93535d1f1bd4b6c14d05a SHA-256: 3d9e09cc5067c47698c7cf9376ba2d37f906cc9bd03507b5e3d44ce3aa8f0b8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an intent to direct users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://insfilings.com/skyzone_classic/upload/files/76880224441.pdf In PDF document text
    • http://yepuco.com/uploads/files/jodejotigizuperijozo.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fejewiguzedebud.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/tanupilefunomalifevodoma.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161362585bc40f---xukoxizis.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109081421057144.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/gijidupopuwebotiloganip.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/15111552713.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/53365419695.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/73181549186.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lekagefukofukebusupibosog.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/birazafedanidare.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/76883790697.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/pefinawixexad.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/gaxavunidukomiribilet.pdfIn PDF document text
    • http://dolonchem.com/upload/files/redewubebu.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/65652196110.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/2149774171.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/wirovino.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/77651982481.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3ff00d305c2a55aee55cb02c6f8c64dc/fukoxe.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161474c413b8f2---3366743411.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/tanofobuvixuwusew.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/33891919097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=delay+in+notification+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 18176 bytes
SHA-256: 72cc752911f9b7e5c53a54ba8c310b162690830f1a5a916cf5a177013769f044
font_02_sfnt_off00010dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 10416 bytes
SHA-256: bc826df0b061e92790ada2ce49078412ddd53ee63a1b370ee7aa72c9aeea8a28